The beam angle is the degree of width that light emanates from a light source. Specifically: The angle between those points on opposite sides of the beam axis where the intensity drops to 50% of maximum. Common terms in selecting a light bulb are 'flood' light or 'spot' light. These are designations of beam angle.

Color Temperature

Color temperature is a characteristic of visible light that has important applications in lighting. The color temperature of a light source is the temperature of an ideal black-body radiator that radiates light of comparable hue to that of the light source. Color temperature is conventionally stated in the unit of absolute temperature, the kelvin, having the unit symbol K. Color temperatures over 5,000K are called Day light colors (blueish white), while lower color temperatures (2,700–3,000K) are called Warm light colors (yellowish white through red). Colors between 3000K to 5000K are usually called Cool light colors (most whitish).

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